CN110305998B - Online regulation and control method and device for reducing S content in blast furnace gas - Google Patents
Online regulation and control method and device for reducing S content in blast furnace gas Download PDFInfo
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- CN110305998B CN110305998B CN201910579484.2A CN201910579484A CN110305998B CN 110305998 B CN110305998 B CN 110305998B CN 201910579484 A CN201910579484 A CN 201910579484A CN 110305998 B CN110305998 B CN 110305998B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/006—Automatically controlling the process
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/04—Making slag of special composition
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- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
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Abstract
The invention discloses an online regulation and control method and device for reducing the content of S in blast furnace gas, comprising the following steps: the method has the advantages that the flue gas composition of the blast furnace gas after combustion of the blast furnace gas in the hot blast stove is monitored to reversely guide the regulation and control of the blast furnace, the distribution proportion of sulfur in blast furnace slag is increased and the proportion of sulfur in the gas is reduced by changing the series of operations such as blast furnace burden structure, distribution, alkalinity and the like of the blast furnace, and finally the aim of controlling the content of the blast furnace gas S is achieved.
Description
Technical Field
The invention belongs to the technical field of iron making, and relates to an online regulating and controlling method and device for reducing the content of S in blast furnace gas.
Background
The blast furnace gas generated by the blast furnace contains sulfide gas, and the content of the sulfide gas fluctuates, so that the situation that the emission of S in flue gas exceeds the standard sometimes occurs in the using process of the blast furnace gas, and how to control the emission of S in the gas to be within the environmental standard range has important significance for reducing the emission of S in iron and steel enterprises.
At present, the method is realized by arranging a desulfurization deviceRelated technology for solving the problem of excessive sulfur in flue gas, for example, patent 201910042224.1, a method for desulfurizing and purifying blast furnace gas, comprising the steps of: s1, the blast furnace gas enters an organic sulfur conversion device after being dedusted by a dry cloth bag dedusting device, and the organic sulfur is converted into H2S; s2, then, the mixed gas enters a residual pressure turbine power generation device to recover pressure energy and heat energy; and S3, removing hydrogen sulfide in the cooled blast furnace gas by a wet desulphurization device, and then removing hydrogen sulfide in each user unit. The invention aims at utilizing the temperature and the pressure of blast furnace gas to carry out organic sulfur conversion, and utilizing the temperature reduction of the blast furnace gas after passing through a residual pressure turbine power generation device (TRT) to carry out H2The removal of S realizes the removal of sulfide in the blast furnace gas, and does not influence the recovery of the pressure energy and the heat energy of the blast furnace gas of the residual pressure turbine power generation device. The patent is specially designed with a desulfurizing device outside the blast furnace for removing H in the coal gas2S, but the method can not exert the self-desulfurization effect of the blast furnace, thereby influencing the stability of the iron system and increasing the cost investment of sulfur reduction.
At present, there is also a related technology for solving the problem of over standard of the sulfur in the flue gas by adsorbing and removing the sulfur in the coal gas, for example, patent 201611154112.8, a dry purification method and a system for blast furnace coal gas, the method adopts a chemical looping combustion reactor and two adsorption towers, the carrier gas is heated by the heat release of the chemical looping combustion reaction, then the adsorbent is desorbed and regenerated by high temperature carrier gas, and the desorbed NH is3And introducing the air into the chemical looping combustion reactor to perform reduction reaction with the oxidation state oxygen carrier, introducing the air into the chemical looping combustion reactor to perform oxidation regeneration process of the reduction state oxygen carrier after the desorption of the adsorbent in the adsorption tower is completed, and alternately adsorbing and regenerating by adopting two parallel adsorption towers to realize high-efficiency dry purification of the blast furnace gas. The invention can thoroughly remove harmful impurities such as ammonia, chlorine, sulfur and the like in blast furnace gas by filling basic oxide serving as an adsorbent in the adsorption tower, and can remove desorbed NH by additionally arranging a chemical-looping combustion reactor3Advanced treatment is carried out, and the reaction heat released by the reaction in the chemical-looping combustion reactor can provide heat for desorption and regeneration of the adsorbent. The method is to adsorb the S element in the blast furnace gas by a chemical methodThe desulfurization effect of the blast furnace cannot be effectively applied even in relation to heating, use of a desulfurizing agent, addition of processing equipment, and the like, and the energy consumption and cost of the process of the invention are also significantly increased.
In summary, the existing flue gas desulfurization technology usually needs to introduce desulfurization equipment or a desulfurizer on the basis of the original process and equipment, and the desulfurization effect of a blast furnace cannot be effectively applied, so that the desulfurization cost is high. How to effectively apply the desulfurization effect of the blast furnace and control the S in the coal gas to be within the environmental protection standard range at lower cost has important significance for reducing the S emission of steel enterprises.
Disclosure of Invention
In view of the above, the invention provides an online regulation and control method and device for reducing the S content in blast furnace gas, which can realize the high slag temperature desulfurization technology under the condition of ensuring no increase or little increase of fuel ratio by adjusting the burden distribution system of a blast furnace.
In the research process, the main discharge way of S generated by blast furnace smelting is slag, which accounts for more than 80% of the total S amount; 8-10% of molten iron; the blast furnace gas accounts for 5-7%, and the top ash accounts for 3-5%, so the method guides the regulation and control of the blast furnace in a reverse direction by monitoring the smoke components of the blast furnace gas after the blast furnace gas is combusted, and the distribution proportion of sulfur in blast furnace slag is increased and the proportion of sulfur in gas is reduced by changing the series of operations such as blast furnace burden structure, distribution, alkalinity and the like, thereby finally achieving the purpose of controlling the S content of the blast furnace gas and overcoming the problem that the S content in the gas of the blast furnace is increased in a short time due to the change of the furnace type.
The invention provides an online regulation and control method for reducing the S content in blast furnace gas, which increases the contact amount of blast furnace slag with gas and coke and improves the desulfurization capability of slag under the condition of ensuring no increase or little increase of fuel ratio by adjusting the burden distribution system of the blast furnace, thereby achieving the purpose of reducing the S content in the blast furnace gas. The method comprises the following steps:
s1, adjusting the burden system of the blast furnace on the premise of keeping the ore/coke mass ratio of each batch of the blast furnace unchanged, wherein the adjustment comprises the following steps: the number of the blast furnace material distribution turns is 8, the mass ratio of ore to coke of a No. 1 to No. 3 material distribution turn in the center of the blast furnace is kept unchanged, the mass ratio of ore to coke of a No. 4 to No. 6 material distribution turn is reduced by 2 to 4 percent, the mass ratio of ore to coke of a No. 7 material distribution turn is improved by 3 to 6 percent, the mass ratio of ore to coke of a No. 8 material distribution turn is improved by 8 to 12 percent, and the smelting speed of the blast furnace is controlled to be unchanged;
s2, performing callback after the half smelting period of the blast furnace, wherein the callback comprises the following steps: keeping the mass ratio of ore to coke of a No. 1-3 material distribution ring in the center of the blast furnace unchanged, improving the mass ratio of ore to coke of a No. 4-6 material distribution ring by 1.5-2.5%, reducing the mass ratio of ore to coke of a No. 7 material distribution ring by 2-3%, and reducing the mass ratio of ore to coke of a No. 8 material distribution ring by 5-8%;
s3, tracking and detecting SO in blast furnace slag2Content and SO in flue gas of hot blast stove2The content of the compound is changed.
The invention improves the distribution ratio of the furnace charge and the coke in the radial direction of the blast furnace and the distribution of gas and sulfur in the furnace charge, so that the iron-containing furnace charge can be more fully contacted with the coke and the blast furnace gas when molten slag iron is formed in a soft melting zone of the blast furnace, and the distribution ratio of S in the blast furnace is inclined to the blast furnace slag and the iron, thereby reducing the content of S in the gas in the blast furnace.
Preferably, SO is present in the flue gas of a hot blast furnace in which the blast furnace gas is combusted before the above process is carried out2The content is tested when SO2More than 50mg/m3Step S1 is performed.
More preferably, when SO2Up to 70-200 mg/m3Step S1 is performed.
Preferably, in step S1 of the method, the adjusting further includes: CaO/SiO of No. 6, No. 7 and No. 8 material distribution rings2The ratio is increased by 0.1-0.3. The invention further enables S to be absorbed by slag by combining with proper improvement of alkalinity, thereby achieving the purpose of reducing the content of S in the gas in the blast furnace.
More preferably, in step S2, the callback further includes: CaO/SiO of No. 6, No. 7 and No. 8 material distribution rings2The ratio is reduced by 0.1-0.2. The invention makes the S content of the blast furnace gas reach the S content after combustion by a method of properly adjusting the blast furnace burden distribution and the alkalinity excessively and then reasonably returning and supplementingMeets the requirement of environmental protection.
Preferably, in step S3, SO is contained in the flue gas of the hot blast stove2The content is higher than 80mg/m3When in use, the mass ratio of ore/coke of each batch of the blast furnace is reduced by 0.1-0.3; when SO is contained in flue gas of hot blast stove2The content is not higher than 80mg/m3While maintaining the ore/coke mass ratio of each batch of the blast furnace constant.
More preferably, the method further includes step S4: detecting SO in the flue gas of the hot blast furnace after passing through a smelting period of the blast furnace2Content of SO in flue gas of hot blast stove2The content is not higher than 50mg/m3In the process, the mass ratio of ore/coke of each batch of the blast furnace is increased by 0.1-0.2; when SO is contained in flue gas of hot blast stove2The content is higher than 50mg/m3While maintaining the ore/coke mass ratio of each batch of the blast furnace constant.
Preferably, the half smelting period of the blast furnace is 16-18 batches.
Preferably, in step S1, the adjusting further includes: and increasing the temperature of the furnace slag by 15-25 ℃. The invention further enables S to be absorbed by slag by combining with proper increase of the temperature of the slag, thereby achieving reduction of the content of S in the gas in the blast furnace.
The method provided by the invention can be implemented without introducing new equipment, and further, the method can be automated by an online regulation and control device for reducing the S content in the blast furnace gas, which is provided by the second aspect of the invention, wherein the device comprises an acquisition module, a calculation module and an adjustment module;
the acquisition module is used for acquiring SO in the flue gas of the blast furnace hot blast stove2Content (c);
the calculation module is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution rings according to the information obtained by the obtaining module;
and the adjusting module is used for adjusting the blast furnace distributing device to distribute the materials according to the ore/coke mass ratio adjustment amount obtained by the calculating module.
Preferably, the calculation module comprises a first calculation unit and a second calculation unit;
the first calculating unit is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution ring according to the information obtained by the obtaining module;
the second calculation unit is used for obtaining CaO/SiO of the No. 6-8 material distribution ring according to the information obtained by the obtaining module2A proportional adjustment amount;
the adjusting module comprises a first adjusting unit and a second adjusting unit;
the first adjusting unit is used for adjusting the blast furnace distributing device to distribute according to the ore/coke mass ratio adjustment obtained by the first calculating unit;
the second adjusting unit is used for adjusting the CaO/SiO obtained by the blast furnace distributing device according to the second calculating unit2And (5) distributing the materials according to the proportion adjustment amount.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention improves the desulfurization capability of the slag according to the principle of increasing the contact amount of the blast furnace slag with the coal gas and the coke, and fully utilizes the desulfurization function of the blast furnace, thereby achieving the purpose of reducing S in the blast furnace gas.
(2) The invention realizes the high slag temperature desulfurization technology by adjusting the burden distribution system of the blast furnace under the condition of ensuring that the fuel ratio is not increased or is slightly increased, and has low desulfurization cost.
(3) The invention respectively takes the half period and the full period of the blast furnace smelting as nodes, and leads the S content after the blast furnace gas combustion to reach the environmental protection requirement by a method of properly adjusting the blast furnace material distribution and the alkalinity excessively and then reasonably returning and supplementing, thereby being easy to control, having good desulfurization effect and having good application prospect.
Drawings
FIG. 1 is a schematic process flow diagram of example 1 of the present invention.
FIG. 2a is a schematic sectional view showing the adjustment of the burden distribution in the blast furnace in example 1 of the present invention.
FIG. 2b is a schematic top view of the burden distribution adjustment of the blast furnace in example 1 of the present invention
Detailed Description
The invention provides an online regulation and control method for reducing the S content in blast furnace gas, which comprises the following steps:
in use highSO in hot blast stove flue gas of stove gas combustion2More than 100mg/m3The method for controlling the content of S in the blast furnace gas comprises the following steps: (1) the radial distribution position of the coke in the blast furnace is controlled, and the control idea is that the ratio of ore and coke of each batch of the blast furnace is kept stable. The invention controls the proportion of the ore and the coke of each batch of the blast furnace to be kept stable, so that the heat utilization rate of the blast furnace can be improved by changing the burden distribution mode of the blast furnace under the condition of not increasing the fuel consumption of the blast furnace, and the aim of adsorbing S by high-temperature slag is fulfilled.
(2) The material distribution system requires that the ore/coke ratio of the No. 1 to No. 3 material distribution rings in the stabilization center is unchanged, the ore/coke ratio of the No. 4 to No. 6 material distribution rings is reduced by 2 to 4 percent, the ore/coke ratio of the No. 7 material distribution rings is improved by 3 to 6 percent, the ore/coke ratio of the No. 8 material distribution rings is improved by 8 to 12 percent, the distribution positions of the No. 1 to No. 8 material distribution rings are specifically shown in figure 1, and the smelting speed of the blast furnace is controlled to be unchanged at the same time.
The invention ensures that the ratio of ore/coke of No. 1 to No. 3 rings of the stable center is unchanged, and aims to ensure that the central airflow of the blast furnace is smooth, so that the blast furnace can remove S in coal gas and ensure the stable and smooth running of the blast furnace.
The invention reduces the ratio of ore/coke of No. 4 to No. 6 rings by 2 to 4 percent, so that more gas flow of the blast furnace passes through a middle ring slag zone for desulfurization, and part of gas flow reaches the center; the proportion of No. 7 ore/coke is improved by 3-6%, the proportion of No. 8 ore/coke is improved by 8-12%, most of blast furnace gas is concentrated in an edge ring belt, the retention time of the gas in the blast furnace is prolonged by increasing the proportion of ore, the heat efficiency of the blast furnace can be improved, the slag and the blast furnace gas are fully contacted for desulfurization, and the proportion of ore in No. 7 and No. 8 rings is increased greatly, so that the S in the gas is quickly and effectively controlled to be continuously increased.
(3) CaO/SiO for improving No. 6, No. 7 and No. 8 radial rings2The ratio (alkalinity) is 0.1-0.3. The invention improves the alkalinity of No. 6, No. 7 and No. 8 radial rings, has better S removal effect of high-alkali slag, and does not have great influence on the operation of the blast furnace. And increasing the temperature of the slag by 15-25 ℃ to further absorb the S by the slag, thereby reducing the content of the S in the gas in the blast furnace.
(4) After 16-18 batches, the material distribution system is adjusted as follows: the ore/coke ratio of the No. 1 to No. 3 material distribution rings of the continuous stable center is unchanged, the ore/coke ratio of the No. 4 to No. 6 material distribution rings is improved by 1.5 to 2.5 percent, the ore/coke ratio of the No. 7 material distribution rings is reduced by 2 to 4 percent, the ore/coke ratio of the No. 8 material distribution rings is reduced by 5 to 8 percent, and the CaO/SiO ratio of the No. 6, No. 7 and No. 8 material distribution rings is2The ratio was adjusted back to 0.1. The adjustment is performed in half of the smelting period of the 16-18 batch position blast furnace, the adjustment is slightly excessive for effectively reducing the S in the blast furnace gas, the effect is basically displayed after the half of the smelting period, a certain amount of adjustment needs to be performed in time, otherwise, the blast furnace shape is changed for a long time, the smooth operation of the blast furnace is influenced, and the fuel consumption of the blast furnace is increased and is not compensated.
(5) Tracking the change conditions of S in blast furnace slag and S in hot blast stove flue gas after 16-18 batches of materials so as to check the adjustment effect; such as SO in flue gas2Higher than 80mg/m3And the weight ratio of the ore and the coke of each batch of the blast furnace is reduced by 0.1-0.3, and because of insufficient adjustment, the desulfurization capacity of the blast furnace is remarkably improved by continuously increasing the temperature of the blast furnace slag iron, namely slightly increasing the fuel consumption of the blast furnace.
(6) Because the heat effect of the coke can only act in one smelting period, 34-36 batches are processed, and the SO in the blast furnace hot blast stove flue gas is detected2Whether the content of (B) is controlled to 50mg/m3And observing the change of S in the blast furnace slag, and adjusting the weight ratio of the ore and the coke in each batch to be 0.1-0.2 according to the furnace condition, wherein after the temperature of the slag in the blast furnace is sufficient, if the temperature is continuously increased, the smooth operation of the blast furnace is influenced, so the fuel consumption is reduced.
The automation of the method is realized by the online regulating and controlling device for reducing the S content in the blast furnace gas, which comprises an acquisition module, a calculation module and an adjustment module;
the acquisition module is used for acquiring SO in the flue gas of the blast furnace hot blast stove2Content (c);
the calculation module is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution rings according to the information obtained by the obtaining module;
and the adjusting module is used for adjusting the blast furnace distributing device to distribute the materials according to the ore/coke mass ratio adjustment amount obtained by the calculating module.
Preferably, the calculation module comprises a first calculation unit and a second calculation unit;
the first calculating unit is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution ring according to the information obtained by the obtaining module;
the second calculation unit is used for obtaining CaO/SiO of the No. 6-8 material distribution ring according to the information obtained by the obtaining module2A proportional adjustment amount;
the adjusting module comprises a first adjusting unit and a second adjusting unit;
the first adjusting unit is used for adjusting the blast furnace distributing device to distribute according to the ore/coke mass ratio adjustment obtained by the first calculating unit;
the second adjusting unit is used for adjusting the CaO/SiO obtained by the blast furnace distributing device according to the second calculating unit2And (5) distributing the materials according to the proportion adjustment amount.
In order to facilitate understanding of the present invention, the present invention will be described in more detail with reference to the following examples, but the scope of the present invention is not limited to the following specific examples.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention. For example, the No. 1-8 material distribution ring of the invention refers to a concentric circle structure which is positioned on the bottom surface of a blast furnace and is uniformly distributed from inside to outside by taking the center of the bottom of the blast furnace as the center of a circle.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The on-line regulation method and the device for reducing the S content in the blast furnace gas are described in detail by combining 4 specific examples.
Example 1
The embodiment provides an online regulation and control method for reducing the content of S in blast furnace gas, a flow diagram is shown in fig. 1, and the steps are as follows:
detecting SO in flue gas generated after combustion of coal gas generated by Wu steel 7# blast furnace2The content is 97.4-118.6 mg/m3In this case, the charging amount of each batch of ore and the charging amount of each batch of coke in the blast furnace are 90.6 tons, and in order to reduce the S content in the blast furnace gas, the following steps are performed:
1) the loading of each batch of ore of the blast furnace is kept to be 90.6 tons, and the loading of coke is kept to be 16.5 tons.
2) Through setting for the number of turns of blowing floodgate opening degree and distributing device on each circle position, make the ore of 1~3 cloth circle in center/coke proportion unchangeable, 4~6 cloth circle ore/coke proportion reduce 2.5%, No. 7 cloth circle ore/coke proportion improve 4%, No. 8 cloth circle ore/coke proportion improve 9%, control blast furnace smelting speed unchangeable simultaneously.
Specifically, a schematic position diagram of the blast furnace burden distribution ring of the embodiment is shown in fig. 2. The material tank is characterized in that ores and cokes are alternately loaded into the material tank right above the blast furnace, the distributing device is located below the material tank, the material is gradually transited to the position of the No. 1 ring from the No. 8 ring at the edge under the condition of changing the inclination angle through the rotating distributing device, the purpose of distributing materials at different gears is achieved, and the material distributing quantity is changed at different gears by controlling the opening degree of a material discharging gate of the material tank and the number of turns of distributing materials at each ring.
3) While changing different circles of ores/cokes in the step 2), improving the distribution structure of No. 6, 7 and 8 distribution circles to improve the sintered ore proportion by 5 percent, thereby improving the CaO/SiO ratio at the 6, 7 and 8 circles2The ratio (basicity) was increased by 0.15.
4) After 16 batches, the distribution was adjusted as follows: the ore/coke ratio of No. 1 to No. 3 circles of the center is continuously stabilized to be unchanged, the ore/coke ratio of No. 4 to No. 6 circles is improved by 1.5 percent, the ore/coke ratio of No. 7 circles is reduced by 2 percent, the ore/coke ratio of No. 8 circles is reduced by 5 percent, and CaO/SiO of No. 6, No. 7 and No. 8 radial circles are stabilized2The ratio was adjusted back to 0.10.
5) After step 4 is completed, the changes of S in blast furnace slag and S in hot blast stove flue gas are measured, and the results are shown in Table 1.
TABLE 1 blast furnace gas SO before and after the practice2S and molten iron change in blast furnace slag
Example 2
The embodiment provides an online regulation and control method for reducing the content of S in blast furnace gas, which comprises the following specific steps:
detecting SO in flue gas generated after combustion of coal gas generated by Wu steel 7# blast furnace2The content is 123.0-137.9 mg/m3In this case, the charging amount of each batch of ore and the charging amount of each batch of coke in the blast furnace were 94.1 tons, and in order to reduce the S content in the blast furnace gas, the following steps were performed:
1) the loading of each batch of ore of the blast furnace is kept to be 94.1 tons, and the loading of coke is kept to be 17.3 tons.
2) Through setting for the number of turns of blowing floodgate opening degree and distributing device on each circle position, make the ore of 1~3 rings in center/coke proportion for unchangeable, 4~6 rings ore/coke proportion reduce 3.5%, No. 7 rings ore/coke proportion improve 5%, No. 8 rings ore/coke proportion improve 11%, control blast furnace smelting speed is unchangeable simultaneously.
3) While changing different circles of ores/cokes in the step 2), the ratio of the sintered ores in the No. 6, 7 and 8 radial circle distribution structures is improved by 9 percent, so that CaO/SiO at the circles of 6, 7 and 8 is improved2The ratio (basicity) was increased by 0.25.
4) After 15 batches, the distribution was adjusted as follows: the O/C ratio of No. 1-3 rings of the center is continuously stabilized to be unchanged, the ore/coke ratio of No. 4-6 rings is improved by 2%, the ore/coke ratio of No. 7 rings is reduced by 3%, the ore/coke ratio of No. 8 rings is reduced by 6%, and CaO/SiO of No. 6, No. 7 and No. 8 radial rings are stabilized2The ratio is adjusted back to 0.15.
5) And (3) measuring the change conditions of S in blast furnace slag and S in hot blast stove flue gas while completing the step 4), and the results are shown in Table 2.
TABLE 2 blast furnace gas SO before and after the implementation2Blast furnaceChange of S and molten iron in slag
6) From the results of the step 5), SO in the flue gas after the combustion of the blast furnace gas is known2Still higher than 50mg/m3The weight ratio of ore to coke for each batch of the blast furnace is adjusted to be 0.15 lower.
7) After 35 batches, testing SO in flue gas of blast furnace after combustion2And the amount of S in the blast furnace slag, as shown in Table 3, meet the requirements.
TABLE 3 blast furnace gas SO before and after the implementation2S and molten iron change in blast furnace slag
Example 3
The embodiment provides an online regulation and control method for reducing the content of S in blast furnace gas, which comprises the following specific steps:
detecting SO in flue gas generated after combustion of coal gas generated by Wu steel 7# blast furnace2The content is 84.1-92.8 mg/m3In this case, the charging amount of each batch of ore and the charging amount of each batch of coke in the blast furnace were 93.4 tons, and the following steps were performed to reduce the S content in the blast furnace gas:
1) keeping the loading amount of each batch of ore of the blast furnace to be 93.4 tons and the loading amount of coke to be 17.0 tons,
2) through setting for the number of turns of blowing floodgate opening degree and distributing device on each circle position, make the ore of 1~3 rings in center/coke proportion unchangeable, 4~6 rings ore/coke proportion reduce 2%, No. 7 rings ore/coke proportion improve 3%, No. 8 rings ore/coke proportion improves 8%, and the control blast furnace smelting speed is unchangeable simultaneously.
3) While changing different circles of ores/cokes in the step 2), the ratio of the sintered ores in the No. 6, 7 and 8 radial circle distribution structures is improved by 3 percent, so that CaO/SiO at the circles of 6, 7 and 8 is improved2Ratio (basicity)) The increase is 0.1.
4) After 16 batches, the distribution was adjusted as follows: the ore/coke ratio of No. 1 to No. 3 circles of the center is continuously stabilized to be unchanged, the ore/coke ratio of No. 4 to No. 6 circles is improved by 1.5 percent, the ore/coke ratio of No. 7 circles is reduced by 2 percent, the ore/coke ratio of No. 8 circles is reduced by 5 percent, and CaO/SiO of No. 6, No. 7 and No. 8 radial circles are stabilized2The ratio was adjusted back to 0.05.
5) And (4) after the step (4) is finished, measuring the change conditions of S in blast furnace slag and S in hot blast stove flue gas, and obtaining the results shown in the table 4 to meet the requirements.
TABLE 4 blast furnace gas SO before and after the implementation2S and molten iron change in blast furnace slag
Example 4
The embodiment provides an online regulating and controlling device for reducing the S content in blast furnace gas, which comprises an acquisition module, a calculation module and an adjustment module;
the acquisition module is used for acquiring SO in the flue gas of the blast furnace hot blast stove2Content (c);
the computing module comprises a first computing unit and a second computing unit;
the first calculating unit is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution ring according to the information obtained by the obtaining module;
the second calculation unit is used for obtaining CaO/SiO of the No. 6-8 material distribution ring according to the information obtained by the obtaining module2A proportional adjustment amount;
the adjusting module comprises a first adjusting unit and a second adjusting unit;
the first adjusting unit is used for adjusting the blast furnace distributing device to distribute according to the ore/coke mass ratio adjustment obtained by the first calculating unit;
the second adjusting unit is used for adjusting the CaO/SiO obtained by the blast furnace distributing device according to the second calculating unit2And (5) distributing the materials according to the proportion adjustment amount.
Firstly, the acquisition module is used for acquiring SO in the flue gas of the blast furnace hot blast stove2And (4) content value.
SO in flue gas obtained by obtaining module2The content exceeds 50mg/m3Then, the first calculation unit derives the following adjustment scheme: the ore/coke ratio of 1-3 circles of the stabilization center is unchanged, the ore/coke ratio of 4-6 circles is reduced by 2-4%, the ore/coke ratio of 7 circles is improved by 3-6%, and the ore/coke ratio of 8 circles is improved by 8-12%; the second calculation unit derives the following adjustment: 6. CaO/SiO of No. 7 and No. 8 radial rings2The ratio is improved by 0.1-0.3, and the ratio of each batch of ore to coke in the blast furnace is kept unchanged.
The first adjusting unit controls the inclination angle of the distributing device to distribute materials according to the adjusting scheme of the first calculating unit, and the second adjusting unit controls the inclination angle of the distributing device to distribute materials according to the adjusting scheme of the second calculating unit after the materials in the material tank are replaced.
Controlling the smelting speed of the blast furnace to be unchanged, and obtaining SO in the flue gas of the blast furnace hot blast stove by the obtaining module after 16-18 batches of materials2And (4) content value.
SO in flue gas obtained by obtaining module2The content exceeds 80mg/m3Then, the first calculation unit derives the following adjustment scheme: continuously stabilizing the O/C ratio of the No. 1 to No. 3 rings of the center unchanged, increasing the ore/coke ratio of the No. 4 to No. 6 rings by 1.5 to 2.5 percent, reducing the O/C ratio of the No. 7 ring by 2 to 4 percent, and reducing the O/C ratio of the No. 8 ring by 5 to 8 percent; the second calculation unit derives the following adjustment: 6. CaO/SiO of No. 7 and No. 8 radial rings2The proportion is increased by 0.1-0.3, and the weight proportion of the ore and coke in each batch of the blast furnace is reduced by 0.1-0.3.
SO in flue gas obtained by obtaining module2The content is not more than 80mg/m3Then, the first calculation unit derives the following adjustment scheme: continuously stabilizing the O/C ratio of the No. 1 to No. 3 rings of the center unchanged, increasing the ore/coke ratio of the No. 4 to No. 6 rings by 1.5 to 2.5 percent, reducing the O/C ratio of the No. 7 ring by 2 to 4 percent, and reducing the O/C ratio of the No. 8 ring by 5 to 8 percent; the second calculation unit derives the following adjustment: 6. CaO/SiO of No. 7 and No. 8 radial rings2The ratio is increased by 0.1-0.3.
The first adjusting unit controls the inclination angle of the distributing device to distribute materials according to the adjusting scheme of the first calculating unit, and the second adjusting unit controls the inclination angle of the distributing device to distribute materials according to the adjusting scheme of the second calculating unit after the materials in the material tank are replaced.
And after 34-36 batches of materials are carried out, the acquisition module acquires SO in the flue gas of the blast furnace hot blast stove again2Content value if the content is not more than 50mg/m3The calculation module derives the following adjustment scheme: and (3) the weight ratio of the ore to the coke of each batch of the blast furnace is adjusted back to 0.1-0.2.
And the adjusting module controls the inclination angle of the distributing device to distribute the materials according to the adjusting scheme of the calculating module.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (5)
1. An online regulation and control method for reducing the S content in blast furnace gas comprises the following steps:
s1, adjusting the burden system of the blast furnace on the premise of keeping the ore/coke mass ratio of each batch of the blast furnace unchanged, wherein the adjustment comprises the following steps: the number of the blast furnace material distribution turns is 8, the mass ratio of ore to coke of a No. 1 to No. 3 material distribution turn in the center of the blast furnace is kept unchanged, the mass ratio of ore to coke of a No. 4 to No. 6 material distribution turn is reduced by 2 to 4 percent, the mass ratio of ore to coke of a No. 7 material distribution turn is improved by 3 to 6 percent, the mass ratio of ore to coke of a No. 8 material distribution turn is improved by 8 to 12 percent, and the smelting speed of the blast furnace is controlled to be unchanged;
s2, performing callback after the half smelting period of the blast furnace, wherein the callback comprises the following steps: keeping the mass ratio of ore to coke of a No. 1-3 material distribution ring in the center of the blast furnace unchanged, improving the mass ratio of ore to coke of a No. 4-6 material distribution ring by 1.5-2.5%, reducing the mass ratio of ore to coke of a No. 7 material distribution ring by 2-3%, and reducing the mass ratio of ore to coke of a No. 8 material distribution ring by 5-8%;
s3, tracking and detecting SO in blast furnace slag2Content and SO in flue gas of hot blast stove2The change of the content;
SO in hot blast furnace flue gas generated by blast furnace gas combustion2The content is tested when SO2More than 50mg/m3Step S1 is performed;
in step S1, the adjusting further includes: CaO/SiO of No. 6, No. 7 and No. 8 material distribution rings2The proportion is improved by 0.1-0.3;
in step S2, the callback further includes: CaO/SiO of No. 6, No. 7 and No. 8 material distribution rings2The proportion is reduced by 0.1-0.2;
in step S3, SO in the flue gas of the hot blast stove2The content is higher than 80mg/m3When in use, the mass ratio of ore/coke of each batch of the blast furnace is reduced by 0.1-0.3; when SO is contained in flue gas of hot blast stove2The content is not higher than 80mg/m3While maintaining the ore/coke mass ratio of each batch of the blast furnace constant.
2. The on-line regulation method for reducing the S content in blast furnace gas according to claim 1, characterized in that: further comprising step S4: detecting SO in the flue gas of the hot blast furnace after passing through a smelting period of the blast furnace2Content of SO in flue gas of hot blast stove2The content is not higher than 50mg/m3In the process, the mass ratio of ore/coke of each batch of the blast furnace is increased by 0.1-0.2; when SO is contained in flue gas of hot blast stove2The content is higher than 50mg/m3While maintaining the ore/coke mass ratio of each batch of the blast furnace constant.
3. The on-line regulation method for reducing the S content in blast furnace gas according to claim 1, characterized in that: the half smelting period of the blast furnace is 16-18 batches.
4. The on-line regulation method for reducing the S content in blast furnace gas according to claim 1, characterized in that: in step S1, the adjusting further includes: and increasing the temperature of the furnace slag by 15-25 ℃.
5. An online regulation and control device for reducing the S content in blast furnace gas is characterized in that: the device comprises an acquisition module, a calculation module and an adjustment module;
the acquisition module is used for acquiring SO in the flue gas of the blast furnace hot blast stove2Content (c);
the calculation module is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution rings according to the information obtained by the obtaining module;
the adjusting module is used for adjusting the blast furnace distributing device to distribute according to the ore/coke mass ratio adjustment obtained by the calculating module;
the computing module comprises a first computing unit and a second computing unit;
the first calculating unit is used for obtaining the ore/coke mass ratio adjustment quantity of the No. 1-8 material distribution ring according to the information obtained by the obtaining module;
the second calculation unit is used for obtaining CaO/SiO of the No. 6-8 material distribution ring according to the information obtained by the obtaining module2A proportional adjustment amount;
the adjusting module comprises a first adjusting unit and a second adjusting unit;
the first adjusting unit is used for adjusting the blast furnace distributing device to distribute according to the ore/coke mass ratio adjustment obtained by the first calculating unit;
the second adjusting unit is used for adjusting the CaO/SiO obtained by the blast furnace distributing device according to the second calculating unit2And (5) distributing the materials according to the proportion adjustment amount.
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